而以硝态氮肥为氮源时，玉米叶片硝态氮含量和全氮含量最高。
In nitrate fertilizer sources, the contents of nitrogen and nitrate in maize were highest.
供水量和氮肥施用量是影响农田硝态氮淋失的主要因素。
The water and nitrogen applications are the two main factors that affect the nitrate leaching on farmland.
施用氮肥可明显增加土壤硝态氮残留数量，并影响其剖面分布；
Application of N fertilizer significantly increased the amount of residual nitrate-N, and affected its distribution in the soil profile.
尽管施用化学氮肥是提高作物产量的必要措施，但长期大量施用能引起硝态氮在根区以下土层的无效累积。
Although using chemical fertilizer was a necessary measure to increase crop yields, it could cause a large number of nitrate zone of invalid accumulation in the soil.
从第三季作物收获到第五季作物收获，残留硝态氮的增加量占这一时期氮肥施用量的比例高达51.6%。
The increase amount of residual nitrate N from third harvesting to fifth harvesting was 51.6% of the total amount of applied nitrogen during this period.
结果表明：随着氮肥用量的提高，土壤剖面硝态氮累积量明显增加，其向土壤下层淋溶的程度也越严重；
The results show the amounts of NO3-N accumulation in the soil profiles and their extents to leach into the deeper soil layers are increased significantly as the nitrogen fertilizer usage increased.
供水量和氮肥施用量是影响农田硝态氮淋失的主要因素。
A simulative analysis of influence of precipitation on water leakage and nitrogen leaching in irregated farmland;
供水量和氮肥施用量是影响农田硝态氮淋失的主要因素。
A simulative analysis of influence of precipitation on water leakage and nitrogen leaching in irregated farmland;
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